Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.18g&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
We present a new study of the asymmetries of synthetic hydrogen Lyman line profiles and suggest the mechanism of their formation.
In order to obtain the synthetic Lyman line profiles, we use multi-thread prominence fine-structure model consisting of identical vertical 2D threads. The 2D thread models are in magnetohydrostatic (MHS) equilibrium, include an empirical prominence-corona transition region (PCTR) and consistently solve the 2D non-LTE radiative transfer. Individual threads of the multi-thread fine-structure model have a randomly assigned LOS velocities.
The synthetic Lyman spectrum obtained by our multi-thread modelling exhibits substantial asymmetries of the line profiles even thought the LOS velocities of individual threads are only of the order of 10 km s-1. Moreover, our results show that the synthetic Lyman-? profiles may exhibit an opposite asymmetry as compared to higher Lyman lines. These results are in agreement with the observed Lyman line profiles from SOHO/SUMER.
The presence and the behaviour of the asymmetrical profiles of the synthetic Lyman spectrum is in agreement with observed profiles taken by SUMER.
Anzer Ulrich
Gunar S.
Heinzel Petr
Schmieder Brigitte
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